Compressor



canoe/whoa JOHNSON J. G. JOHNSON.

COMPRESSOR. 7 APPLICATION FILED NOV.23, 1920.

Patented Nov. 211, 1922..

ate-m a, a. v amazes UNHTED stares PATENT @FFHQE JOHN G. JOHNSON, OF TACOMA, WASHINGTON, ASSIGNOR F ONE-HALF 'IO JOHN R.

KIELY, OF TACOMA, WASHINGTON.

COMPRESSOR.

Application filed November 23, 1920. Serial No. 425,942.

To allwhomit may concern; hers open into each other centrally of the 55 7 Be it known that 1, JOHN G. JOHNSON, a casing, and are provided at their upper and sub ect of the King of England, and reslower sides with inter-communicating chanldent of the citvykr of Tacoma, county of nels 3 and 4, into which inlet and outlet 5 Pierce, State of ashington, have invented conduits 5 and 6 respectively are extended.

certain new and useful Improvements in Rotatably and eccentrically mounted withto Compressors, of which the following is a in the chambers 2 and 2' are peripherally specification. geared rotors '1, and 8 which are supported My invention relates to improvements in respectively by shafts 9 and 10 so as to to compressors, pumps, and the like; more paroperate in mesh through the communication ticularly, it relates to compressors of that opening between the chambers. The shaft 65 character especially useful in connection 9 is supported at its ends within antiwith certain cooling systems for compressfriction bearings 11 mounted in sockets proing and circulating ammonia gas through vided in faceplates 12 and 13 which close the expansion coils. the opposite'ends of the casing 1, while the The principal object of the invention is shaft 10 extends at one end from the cas- 7o to provide a compressor of the above charing and is equipped with a belt pulley wheel acter that is simple in construction, efiicient 14 whereby the device may be operated.

in operation and wherein the usual valve The rotors 7 and 8 are supported axially 2o mechanism is eliminated. in the plane, of the axial lines of the cylin- It is also an ob ect of the invention to pro ders 2 and 2. and are of a lesser diameter 75 vide a compressor wherein a pair of geared than the chambers. In the present construcrotors operate in mesh eccentrically within tion, each rotor is equipped with four equalcylindrical chambers, and wherein each ly spaced, and radially directed slots 15 rotor is equipped with a plurality of radiwlherein impellers or blades 16 are slidally moving impellers which operate cooperably mounted and which, at their outer 0 atively in such manner as to cause the fluid edges, are geared as required in order that to be compressed to be drawn by a created they will move operatively into mesh with vacuum pressure into the chambers at one the rotor surfaces as they are revolved thereside and to be discharged therefrom at the with. The impellers, when the device is opopposite side. crating, would be moved by centrifugal Another object of the invention is to proforce outwardly to engage the chamber wall vide improvements in the construction of but in order that they may be held effec packing plates, to be used to prevent leaktively in rubbing contact therewith;- I have age about the rotors and to provide means provided sockets 20 in the base ofeach and.

for adjusting the packing plates as is nechave placed coiled springs 2lvtherein, thew essary to take up wear thereon. latter being enga ed by the ends of pins 7 In accomplishing these and other objects 22 that extend slidably through bores 23 r of the invention, I have provided the implaced centrally through the rotors between proved details of construction, the preferred oppositely disposed blades and in registra- B forms of which are illustrated in the accomtion with'the impeller sockets. 96

pan ing drawings, wherein In order to prevent as much as possible Figure 1 is a vertical section through the any leakage about the rotors,I have prohousing of a compressor constructed accordvided, on the opposite ends of each chamber, as ing to the present invention; for the purpose packing or wearing plates 25. These are of better illustration, the rotors and immade circular to snugly fit within the chamice pellers are not sectional. bers'between the rotor ends-and end plates 1, Figure 2 is a horizontal section taken on '2 and 13 and are provided with apertures 26 the line 2-2 in Figure 1. 1 for receiving the rotor shafts. These plates Referring more in detail to the draware adjustably tightened against the rotor i ends by means of set screws, or bolts 28 that 1 designates the compressor housing, or are threaded through the end plates to encasin wherein there are two cylindrical, gage the plates 25 at difierentpoints about paral e1 chambers 2 and 2'. These chamtheir periphery, and which may be ad1usted and forming as is necessary to take up looseness incidental to wear, so that a tight fit may be maintained at all times.

In operation, the rotors are revolved by means of the shaft 10 and as they revolve, the impellers move radially into and from rotors. With the rotors operating in the direction indicated by the arrows thereon in Figure 1, fluid will be drawn into the easing through the conduit 6 by the vacuum pressure created, will fill the expanding pockets between the impeller blades and will be carried upwardlyand finally discharged, as the size of the pockets diminish, through the channel 3 and conduit 5.

Having thus described my invention, what I claim as new therein and desire to secure by Letters-Patent, is: 1

1. A compressor of the class described comprising a casing containing two parallel cylindrical chambers overlapping each other and forming an opening between the same and having inter-communication channels at opposite sides of said opening, respec tively provided with fluid inlet and exhaust conduits, peripherally geared rotors, of smaller diameter than their respective chambers mounted eccentrically therein and meshing with each other through said opening, a plurality of radially movable impellers mounted in each of said rotors, normally extended to engage the cylinder walls and geared at their outer edges to mesh with the geared surfaces of the rotors as the latter are revolved.

2. A compressor of the class described comprising a casing containing two parallel cylindrical chambers overlapping each other an opening between the same and having lnter-communication channels at opposite sides of said opening, respective? provided with fluid inlet and exhaust co duits, peripherally geared rotors, of smaller diameter than their 'respective chambers mounted eccentrically therein to revolve in said chambers and meshing with each other through said opening, a plurality of radially movable impellers mounted in each of said rotors, having gear teeth at their outer edges movable into mesh with the geared surfaces of the rotors, yieldable means for normally retaining said impellers extended to engage the cylinder walls and a drive shaft extending from the casing from one of said, rotors.

3. In a compressor of the class described comprising a casing containing two parallel cylindrical chambers overlapping each other and forming an opening between the same and having inter-communication channels at opposite sides of said opening, respectively provided with fluid inlet and exhaust conduits, peripherally geared rotors, of smaller diameter than their respective chambers mounted eccentrically therein and revoluble in mesh with each other through said opening, said rotors having a plurality of radially and axially directed slots therein and hlaving transverse bores between the opposite s ots, said slots, having sockets in the inner edges impellers mounted to move radially in registering with said bores, coiled springs seated on said sockets, and pins extended through said bores and at their ends engaging said springs to yieldingly retain the impellers extended to engage the cylinder walls, for the purpose set forth.

Signed at Seattle, Washington, this 16th day of November, 1920.

JOHN G. JOHNSON. 

